How to convert the Dual Language RMVB to 1 Language AVI

hahakl

Hi,TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。+ J& u0 ^0 z9 `9 P* k( _
tvb now,tvbnow,bttvb* D& e( O) e4 }& g4 K0 a( e& _
Anyone know what software can I use to convert the 2 language RMVB to 1 language AVI?1 D8 v+ G( x: v( a; n& F# L  J" {% `
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Thank you very much